To jerk only your sac when masturbating. Not the normal occassional tug on the sac, but pulling so hard that you nearly rip it off causing severe pain and swelling in the testicles. Usually done in conjunction with the bloody jack.
by Rev. Reggie Dingleberry August 24, 2004
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Sac Jack • Jacky Sac • Sac-Town • sac-attack • sac fly • sac lunch • sac tap • sac clap • sac chaser • sac magique